Remove, Install & Check Bearing Cover w/ Pitman Arm Shaft

Steering Gear with Adjusting Screw Below:




- Pay attention to "Important Notes Regarding Repair of Steering Gear"
- Remove steering gear from vehicle if not already done.
- For special tool information, Tools and Equipment


Removal:



1. Mount steering gear on assembly support 140 589 00 59 00 with two bolts and clamp in vise.




2. Measure distance "a" between pitman arm (12) and pitman arm shaft/bearing cover (51) and note size "a."




3. Take off locking ring (16). Unscrew nut (14a) and take off bolt (14).
4. Turn steering into center position so that markings are aligned (arrow).

NOTE: If the steering gear is not in the center position, the steering gear housing will be damaged internally when pressing out the pitman arm shaft with the bearing cover/pitman arm shaft.




5. Pull pitman arm (12) off the pitman arm shaft. Use puller 000 589 88 33 00, if necessary.




6. Unscrew self-locking bolts (59) for attaching pitman arm shaft/bearing cover (51).




7. Unscrew collar nut (50) from the adjusting screw (45), holding adjusting screw tight.




8. Rotate assembly support 140 589 0O 59 00 so that the pitman arm shaft is positioned vertically.
9. With steering in center position, turn adjusting screw (45) clockwise; this causes the pitman arm shaft (43) together with the pitman arm shaft/bearing cover (51) to be pressed out of the steering housing (1).




10. Examine the needle bearing (99) and the O-ring located behind it for signs of damage and wear. Ensure that none of the 32 bearing needles drops out of the needle bearing; insert bearing needles with grease if necessary.
11. Prevent the bearing needles in the steering gear housing from dropping out by pushing the shop-made mandrel (090, See Tools and Equipment) over the adjusting screw and securing with the collar nut.

NOTE: A needle bearing with cage has been installed as of approx. 6/92.

Installation:







12. Rotate steering worm so that the middle tooth gap of the power piston (arrow) is located in the center of the opening in the steering gear housing.




NOTE: On steering gear 765.94 (model 140), turn the steering worm until the center tooth flank (arrow) is in the center of the opening in the steering gear.




13. Replace O-rings. Introduce pitman arm shaft/bearing cover (51) together with pitman arm shaft into the steering gear housing so that the center tooth of the pitman arm shaft meshes into the middle tooth gap of the power piston. Ensure that the O-rings are correctly seated.

14. Rotate pitman arm shaft/bearing cover (51) so that oil passage and bore are aligned with those of the steering gear.




15. Turn adjusting screw (45) in the pitman arm shaft (43) far enough to the left for the pitman arm shaft to be making contact in the steering gear housing.

NOTE: Only by screwing in the adjusting screw (45) is it ensured that the pitman arm shaft/bearing cover is touching the steering gear housing.




16. Tighten pitman arm shaft/bearing cover (51) with NEW self-locking bolts (59). Tightening torque 30-35 Nm.




17. Test and adjust friction torque of the steering gear. Checking and Adjusting Friction Torque of Steering Gear

NOTE: A slight pressure point must be felt when rotating beyond the center point. The steering gear must operate easily when the steering worm is turned from lock to lock.




18. Screw collar nut (50) onto the adjusting screw (45) and tighten to 60-65 Nm, holding the adjusting screw (45) tight.
19. Re-check friction torque.




20. Clean shaft spline of the pitman arm shaft and pitman arm (12). Both parts must be free of oil and grease. Coat shaft spline of pitman arm (12) with Loctite 270. Then, push pitman arm onto the pitman arm shaft to the size "a" measured in step number 2 in line with the cross nut.




21. Push in bolt (14). Replace nut (14a), 55 Nm,
22. Install new locking ring (16). Ensure it is correctly seated.
23. Detach steering gear from assembly support.